US Made Free Floating New “TRIDENT” Series Cerakote Flat Dark Earth Finish Machined Double Angle Trident Style Prongs At Front End T6 Aluminum Body Ultra Lightweight Proprietary Barrel Nut Included Total Weight Including Barrel Nut Is 10.8 oz KeyMod System Rail System Slides Over Barrel Nut and is Locked Up Against Receiver With 6 Screws Tight Fit Up Against Receiver, Which Allows For A Monolithic Top Rail 15″ Length Heavy Duty Internal Diameter: 1.34″